Like most CJ Jeep engines it's safe to say it WAS a good motor (and is probably worn out unless it was rebuilt). Whether it still is or not depends on a lot of variables. When you do the Tune up, include a compression test. That will give you some clues as to it's condition, good oil pressure is a sign of good bearings. before you go wheeling you should change oil in EVERYTHING unless the P.O. can convince you he has done it in the last six months and hasn't been in deep water since. Tire size also depends much on where and how you drive it. 32's are as big as you should go without regearing the diffs and you would need at least a 1.5" shackle lift for those. Even then you will get some rubbing. 35's are a bit much for stock axles (a lot of lift and/or fender well cutting goes without saying),'specially if it is a narrow track Jeep (pre 82 I think). the Dana 30 and AMC 20 can work with 35's if you baby the thing offroad. For serious wheeling 32's are pushing the limits of the two piece AMC 20 axles. Results vary widely with the Dana 30, some people wheel 35's on stock axles with out much problem and others tear them up with 33's on a regular basis, again, it all depends who is driving and where. Oh yeah, inspect the brakes and figure on rebuilding at least the rear ones before you drive it much. Good Luck! <img src="/forums/images/graemlins/cheers.gif" alt="" />